... : SS304 or SS316;carbon steel 2.Surface:polished;galvanized 3.Good price and quality Detailed Product DescriptionMetal stamping part/Fastener ... steel;2.Surface treament: polished,galvanized,hot dipped,nickel plating;3.Stainless Steel 304 or 316 spring nut;(Size: 1/ ... 4",3/8",5/16",1/2",M6,M8,M10,M12);4 ... galvanized spring nut(M6,M8,M10,M12,1/4",3/8",1/2",5/16")